(1. 北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，北京 100124；
2. 西北有色金屬研究院，西安 710016)
摘 要: 采用掃描電鏡和透射電鏡分析近β型Ti-1300鈦合金在初始鍛造態(tài)、固溶+淬火態(tài)(β和α+β固溶態(tài))以及固溶+時(shí)效態(tài)下的顯微組織變化。結(jié)果表明：鍛造態(tài)合金中初生α相內(nèi)部發(fā)生孿生切變行為，基體β相晶內(nèi)發(fā)生β→α相變。合金經(jīng)過α+β固溶淬火處理，殘留的初生α相中仍然可觀察到細(xì)小孿生α相。孿生α相有兩種不同變體(α1和α2)，互成60°生長方向，而且與基體α相也成60°的孿生關(guān)系，其間的晶體學(xué)取向關(guān)系為：{1120}α, twinning//{1120}α，á0001？α, twinning //á1101？α。Ti-1300鈦合金與大多數(shù)近β型鈦合金的時(shí)效特征相類似。
關(guān)鍵字: Ti-1300合金；顯微組織；相變；時(shí)效特征
（1. College of Material Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. Northwest Institute for Nonferrous Metal Research, Xi’an 710016, China）
Abstract:The microstructure changes of near β Ti-1300 alloy, including the originally forged sample, the solution treated and the quenched sample (β and (α+β) solid solution state) and solution treated and aged sample, were investigated in detailly by SEM and TEM. The results show that, in the as-forged alloy, the twinning deformation behavior occurs in the primary α phase, the β→α phase transformation also occurs in the base β phase. During the (α+β)-solutionized condition of the forged samples, the twinning α phase is still found in the residual α phase. The twinning α phase has two different variants (α1 and α2), the α1 variant is rotated about 60° with respect to α2 variant, and the two variants have 60° angle twinning relationship with the base α phase, the orientation relationship can be described as follows:{1120}α, twinning//{1120}α, á0001？α, twinning //á1101？α. The aging characteristics of Ti-1300 alloy are similar to the other near β titanium.
Key words: Ti-1300 alloy; microstructure; phase transformation; aging characteristic
